Cut-out fuse



Sept. 8, 1925. 1,553,240

' R. HENDERSON GUT-OUT FUSE 3 Sheets-Sheet 1 Filed July 1922 WITNESS:

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Sept. 8, 1925.

CUT-OUT FUSE Filed July 1922 3 ShBe'gSE-Sheet 2 AMFTDRN EY "eie t. s,1925 1,553,240

' R. HENDERSON CUT-OUT FUSE Filed July 1922 s- Sheets-Sheet 8 I if H331; Q. QQJ X DK wmyz/md ATTORNEY WITNESS:

Patented Sept. 8, 1925.

UNITED STAT-ES BOY HEND RSON, OF COLUMBUS, GEORGIA.

GU'lI-OUT FUSE.

Application filed July 12, 1922.

T (di to/ 10m z't may concern: Y

Be it known that I, ROY HENDERSON, a citizen of the United States,residing at Columbus, in the county of Muscogee and State of Georgia,have inventednew and useful Improvements in Cut-Out Fuses, of which thefollowing is a specification.

This invention relates to fuse devices for interposition in an electriccircuit and has for its object the provision of a novel cut out fuse andlightning arrester designed to be used in connection with transformers,an important object being the provision of a rotatable carrier having aseries of fuse wires mounted thereon, the carrier being rotatable tothrow a selected one of the fuses into the circuit whenever one burnsout.

Another object is the provision of a de vice of this character which isprovided internally with a lightning arrester which is in circuit withthe fuse, the device also including a knife switch for breaking thecircuit when desired.

Another object is the provision of a device of this character in whichthe fuse carrier may be rotated from the outside of the casing or boxwithout necessitating opening the front thereof.

An additional object is the provision of a device of this characterwhich will be simple and inexpensive in manufacture, easy to install,convenient in use and a general improvement in the art.

iVith the above and other objects and advantages in view the inventionconsists in the details of construction to be hereinafter more fullydescribed and claimed and illustrated in the accompanying drawings inwhich:

Figure 1 is a perspective view of the device in closed position, ifFigure 2 is a front elevation thereof with the door in open position,

Figure 3 is a vertical section taken through the lightning arrester,

Figure 4 is a vertical section taken through the fuse carrier,

Figure 5 is a'horizontal sectional view on the line 5 5 of Figure 2,

Figure 6 is a detail cross section on the line 6-6 of Figure 2,

Figure 7 is a horizontal section taken on the line 77 of Figure 2.

Figure 8 is a bottom plan view.

Referring more particularly to the drawings the numeral 10 designates arectangular Serial in). 574,466.

box or casing which is provided at its front with "an upwardly swinginghinged door 11 which may include a glass pane 12 through whichinspection may be made of the interior. This door is provided with abrace 13 which operates to limit its swinging movement and to hold it inopen position when desired. Secured upon the inner face of the door areclips l t for holding a switch throwing stick for a purpose to behereinafter explained. Any suitable brackets are provided on the box orcasing so that it may be mounted at the desired location.

Located within the casing is a vertical partition 18 and a horizontalpartition 19 which operate to define a compartment 20 within which islocated the fuse mechanism to be described. tion 19 is a knife switch 21which has a swingable blade provided with a handle 22 formed with a hole23 within which may be engaged the hook 16 on the stick 15 for thepurpose of moving the switch handle. Located against the back of thecasing between one side thereof and the partition 18 is a lightningarrester 24: designed to carry a current of approximately 2300 volts.EX- tending through the bottom of the casing is an insulator 25 throughwhich passes a wire 26 which is connected with one end of the lightningarrester and which has its other end connected with a suitable groundclamp for the lightning arrester. Extending through one side of thecasing is an insulator 28 through which extends one of the line wires 29which is connected with one terminal of the switch 21 which has itsother terminal connected with the other terminal of the lightningarrester by a wire 30.

Mounted within the compartment 20 are upper and lower bearings 31through which is journaled a shaft 32 which extends through the bottomof the casing and which has its lower end carrying a handle disk 33provided with graduations 34 designed to register with an index mark 35on the bottom of the casing. Mounted upon this shaft between thebearings 31 is a cylinder 36 of porcelain which is formed with aplurality of grooves 87. Mounted upon the reduced ends of this cylinderare metal strips 38 which carry binding screws 39 to which are connectedthe ends of fuse wires 40 which lie within the grooves 37 and which areeasily renewable when burnt out.

Secured upon the back wall of the casing Located above the partiis asupporting block ll upon which is mounted a leaf spring 4-2 which bearsagainst the cylinder for preventing it from having too free rotationwhen turned by means of the handle hiounted on the back of the casingare supports upon which are mounted metallic members i lprovided withbinding posts 45 and 46, The post 45 has a wire l? connect ed therewithwhich leads out through an insulator 4-8 in the side of the casing tothe primary of the transformer not shown. Connected with the post 416 isa wire 4:9 which is connected with the knife switch as shown. The wires29 and LT are of course connected with the line wires o1 the currentsupply. Carried by the metallic members 44 are spring contacts 50 whichbear against the metal strips 38 at the top and bottom of the cylinder.

In the use of the device it will be seen that whenever a fuse wire burnsout the operator grips the handle disk 33 and turns it so that eitheroi? the graduations thereon will. register with the mark 35 which willmean that another wire is thrown into the circuit in place of one burntout. The metal strips 38 engaged by the contacts complete the circuitthrougl'i whichever fuse wire it is desired to use. When necessary toopen the switch the stick 15 may conveniently be used and will avoid thenecessity for the operator to stick his hand into the casing which mightpossibly result in a shock.

lt' preferred each side of the casing may be provided with a hole 5]covered with wire screen to permit expulsion of the air within thecasing in the event of blowing out of any of the fuses, the wire screenpre venting explosion in case the device is used in a gas ladenatmosphere.

From the foregoing description and a study of: the drawings it will beapparent that I have thus provided a simplfl constructed fuse box andcut out switch which has the advantage of incorporating a light ningarrester within itself and which has the great advantage of providing aplurality of fuse wires anyone of which may be used at will so that fusereplacement in the usual manner will be avoided.

\Vhile I have shown and described the preferred embodiment of theinvention it is of course t be understood that I r serve the right tomake such changes in the term, construction and arrangement 01 parts aswill not depart from the spirit of the in veution or the scope of thesubjoined claim.

Having thus described my invention 1 claim:

In a replaceable fuse device, a casing, braci-Iets mounted within thecasing a shaft journaled through said brackets, a cylinder of insulatingmaterial carried by said sl att and prevented from longitudinaldisplacement by engagement of its ends with the lnaclaets said cylinderhaving reduced end portions and being formed with a series oflongitudinal grooves leading to said reduced end portions, metallicstrips secured in spaced relation upon the reduced ends opposite saidgrooves and Cill'ljy'lli fl binding screws. fuse "ires located withinthe grooves with their ends secured by said screws, a stationarysupport, spring lingers carried by the support opposite the reduced endsof the cvlinder and adapted to engage the sun-- res-'s .e metallicstrips, and ro l sprin'm eugagcd beneath the ends of the spring iuns'ersfor urging them into engagement with the strips.

In testimony whercw. l Zil lTC my s gnature.

R O Y H E T DE ll S O N

